Refrigeration Diagnosis
145
•• ••Leaky Zone 1 hot gas solenoid (HGS)
••Closed Zone 1 hot gas solenoid (HGS)
•••Leaky Zone 1 liquid line solenoid (LLS)
• ••• ••Closed Zone 1 liquid line solenoid (LLS)
• Leaky Zone 1 liquid return check vale (LRCV)
••Leaky Zone 1 suction line solenoid (SLS)
•••Leaky Zone 1 suction line check valve (SLCV)
••Leaky Zone 2 hot gas solenoid (RHGS)
•• ••Closed Zone 2 hot gas solenoid (RHGS)
••Leaky Zone 2 liquid line solenoid (RLLS)
•••Closed Zone 2 liquid line solenoid (RLLS)
• Leaky Zone 2 liquid return check valve (RLRCV)
••Leaky Zone 2 suction line solenoid (RSLS)
•••Leaky Zone 2 suction line check valve (RSLCV)
••••Leaky purge valve (PV)
Rapid cycling between Cool and Heat
Unit cools in Heat and Defrost cycle
Unit heats in refrigeration cycle
High head pressure
Low head pressure
No head pressure
High suction pressure
Low suction pressure
No suction pressure
Unit operating in a vacuum
Receiver sight glass empty
Suction line frosting back
Unable to pump down system
Unable to pull vacuum in low side
Unable to hold vacuum in low side
Noisy compressor
Unit not refrigerating
Unit not heating or defrosting
Symptom
Possible Causes
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